Hiro led Baymax back to the old warehouse that had been filled with barrels of microbots, never noticing that a car was following them every step of the way.

He walked up to the warehouse door, but this time it didn't matter whether it was locked. He pointed to the door and Baymax smashed it.

Hiro peeked into the dark warehouse carefully from behind his robot and said, "Get him, Baymax!"

But the warehouse was empty. Hiro was puzzled. "We're too late," he said. He took the petri dish out of his hoodie and watched it. The microbot was vibrating very softly in one direction.

"Your tiny robot is trying to go somewhere," Baymax said.

Hiro turned and walked in the direction the microbot was leading. He headed out the door and down the street. The vibration grew stronger. He smiled. Maybe they weren't too late after all!

He stared down at the petri dish, following the movements of the microbot as if it were a compass. The vibrations were getting stronger with every step he took. Now he knew they were going in the right direction. He was ready to start running when he was yanked from behind by his hoodie. He fell backward and turned to see Baymax.

"Always wait one hour after eating before swimming," Baymax cautioned.

"What?" Hiro said, then looked down and saw that his next step was going to be right into the San Fransokyo Bay! He hadn't realized he'd been walking on a pier for the last few minutes.

Hiro stared out at the cold, dark water. A layer of fog was floating above the bay. He looked at the petri dish again. The microbot was still tapping in the direction of the water, but Hiro didn't see anything out there.

Suddenly, the microbot tapped so hard, the top of the petri dish flew off. Hiro watched the bot disappear into the fog. Then he heard an ominous buzz, soft at first, but gradually getting louder. Slowly a shape emerged. It was the man in the white-and-red Kabuki mask!

Hiro quickly grabbed Baymax and they hid behind a shipping container. He peeked out to see the masked man being transported across the water on a platform—made of a million microbots!

They also seemed to be carrying a strange metal piece. Hiro narrowed his eyes, making out a faint image etched on its side. It looked like an imprint of a bird.

"Your heart rate has increased dramatically," said Baymax.

"Shhh. Okay, Baymax?" Hiro whispered, wanting to stay hidden. "Time to use those upgrades."

Just then, a car came screeching down the street. It drove straight at them! Pressed flat against the container, Hiro and Baymax froze. But they were caught in the headlights.

小宏带着大白回到那个油桶里装满微型机器人的旧仓库。他们没有注意到有辆车跟随着他们走了一路。

他走到仓库门口，但这次他并不在意门是否上了锁。他指了指门，大白便把它踢碎了。

小宏躲在机器人身后，小心地向黑暗的仓库里窥视着，说：“抓住他，大白！”

但是仓库是空的，小宏很疑惑。“我们来晚了。”他说道。他从连帽衫里拿出培养皿，观察着里面的微型机器人，发现它朝着某个方向轻微地震颤着。

“你的小机器人要去某个地方，”大白说道。

小宏转身朝着微型机器人指的方向走去。他出门沿着街道走着。他发现震颤的幅度越来越大。他笑了，或许他们来得不算太晚！

他低头看着培养皿，跟着微型机器人移动的方向前进，就好像那是个指南针一样。他每向前走一步，震颤幅度就变得更大。现在他知道他们走对了方向。他正准备开跑，有人从后面猛拉住他的连帽衫。他向后倒去，转身看着大白。

大白警示他：“饭后一个小时才能游泳。”

“什么？”小宏问道，低头一看，才发现他下一步正要踏进旧金山海湾！几分钟前他都不曾意识到自己正在一处码头上行走。

小宏凝视着冰冷黑暗的海水，一层层雾气从海湾中浮起。他又看了看培养皿。微型机器人仍然朝海水的方向撞击着培养皿内壁，可是小宏望去却什么也没有看见。

突然，微型机器人撞击得更厉害了，培养皿的盖子被撞开了。小宏看着微型机器人消失在雾气里。随后他听到了不祥的嗡嗡声，起初还很微弱，但逐渐变得越来越大。慢慢地一个身影显现了出来，正是那个戴着红白相间歌舞伎面具的男人。

小宏迅速抓住大白，一起躲在了海运集装箱后面。他偷偷地看到那个戴面具的男人正在利用由数以百万计的微型机器人组成的平台运送他渡水。

他们看似还在运送着一块奇怪的金属物体。小宏眯起了眼睛，看到一个模糊的标志刻在旁边，看起来像只鸟的形状。

“你的心率在急剧加块，”大白说道。

“嘘，小点声好吗，大白？”小宏低语着，想要继续隐藏下去。“是时候使用升级后的装备了。”

就在这时，一阵刺耳的汽车刹车声从街道那边传来。车朝他们径直开了过来！小宏和大白的后背紧紧地贴住集装箱，两人僵住了。车头的灯光把他们两个笼罩在内。