Obiora will play newly qualified nurse Lloyd and will appear onscreen in August. Also joining the show is Madeleine Mantock as fellow new nurse Scarlett.
The pair will first be seen in Holby City’s overworked ED on their very first day as newly-trained nurses.
Overconfident Lloyd is full of bravado but viewers soon find out that his heart is in the right place, even when his mouth isn’t. And the more tentative Scarlett is horror struck when she sees her first cardiac arrest but soon proves her worth with a troubled teenage patient.
Series producer Oliver Kent says: “We are delighted to welcome Michael and Madeleine to Casualty.
“Michael is an established young star who brings a great swagger to the role of Lloyd and is sure to be a hit with our younger viewers and Madeleine is an exciting new talent who is already proving herself alongside the more experienced heavy-hitters in the Casualty cast.”