Supersonic Stu is a supervillain who still acts like he's five or six despite being in his thirties already. In the episode "Fear Not", he climbs into Supersonic Sue's arms and sucks his thumb in nervousness when Roddy brings up "major structural instabilities". Roddy is rather disturbed by the display, to say the least.
Example of:
Still Sucks Thumb
Supersonic Stu is a supervillain who still acts like he's five or six despite being in his thirties already. In the episode "Fear Not", he climbs into Supersonic Sue's arms and sucks his thumb in nervousness when Roddy brings up "major structural instabilities". Roddy is rather disturbed by the display, to say the least.
