In the January 2009 sweeps, the hospital is quarantined after one of five toxic spheres detonate during surgery, followed by an anesthesia tank exploding, causing a fire that burns down hospital. The story is used to account for the new hospital set built for the show. Natalia Livingston, previously Emily Quartermaine, returned during this time as Rebecca Shaw, later to be found as Emily's twin sister sold at birth. Ethan Lovett also arrives, later proven to be the son of Holly Sutton and Luke Spencer. In April, Robin Scorpio suffers from postpartum depression. In May, a SORAS teenaged recast Michael Corinthos (now Drew Garrett) wakes up from coma after an experimental surgery, experiencing anger issues. Similarly aged characters Kristina Davis (now Lexi Ainsworth) and Morgan Corinthos are recast as well. A car driven by Edward Quartermaine crashes into the hospital carnival, wreaking havoc.