I was reading this news article today:
阿部サダヲが4年ぶりの主演ドラマで水原希子、山口智子らと共演
In the heading and again in the text is 「山口智子らと共演」
My question is what is the meaning of the らと between Yamaguchi Tomoko and co-starring? I could not find any dictionary reference for it.