Tickets go on sale Tuesday for The Goldthwaite Theatre’s upcoming production of “Superhero Sanitarium,” scheduled for performances April 12-13 at 7 p.m. and April 14 at 2 p.m.The play centers around Lois Landcaser, an investigative reporter who meets a very eclectic group of inmates at the local sanitarium she is investigating.Tickets are $15 each, which can be bought online at the website https:…