Experiment 074 was the 74th genetic experiment created by Jumba with Hämsterviel's funding. She was designed to produce temporary indestructible bubbles. 074 and the other first 624 experiments were deactivated and smuggled to Earth by Jumba during his mission to capture Experiment 626.
All of the experiment pods were released and scattered across the island of Kauai.
Welco is a pink balloon dog-like experiment with dark blue humanoid eyes, big lips, and a heart-like tail.
Powers and abilities
Welco can blow indestructible bubbles from her mouth that last only temporarily. Her bubbles are able to somewhat stick together, and thus can be formed into a cloud. Her body contains a form of helium or another light air, and this causes her to float.
Through some means, she can inflate indestructible balloons that last around 30 minutes. Such means are probably accomplished through her tail or the pink orbs on her head, which is in the same shape as some of her balloons.
Stitch gets kidnapped and tied to one of Welco's balloons during the foretasted typhoon, where he would drown when the balloon popped and have no chance of survival, as he would be restrained from movement. The bubble cloud suddenly pops beneath Hämsterviel, and he plummets to the ground. Later, Gantu sets a trap for Stitch with Welco accompanying him, but Yuna falls into it instead when she is looking for Stitch.
The plan changes and it is decided that Yuna would be bait for Stitch, so they suspend her in a hot air balloon made of dozens of Welco's balloons. Nobody notices Yuna until five minutes before the balloons pop. When the clock reaches zero, her makeshift gondola hits the water, and Stitch dives in to save her, almost making it before sinking. Tigerlily then saves them both.
The fate of Welco after this is unknown.
- Welco is seen in her pod form in Stitch! The Movie. Her pod says 74 instead of 074.
- Her unique design is a reference to animal-shaped balloon art.
- Welco and Cloudy are the only known experiments that are always seen levitating.